* {
    margin: 0;
    padding: 0;
  }

  body{
    background-color: rgba(255,192,203,0.3);
  }
  
  ul {
    list-style: none;
    width: 1400px;
  }
  
  #box {
    width: 1360px;
    height: 540px;
    border: 5px solid rgb(255, 173, 186);
    margin: 100px auto;
    overflow: hidden;
  }
  
  #box li {
    width: 272px;
    height: 540px;
    /*border: 1px solid #000;*/
    float: left;
    background-size: auto 100%;
  }